JP6401049B2 - Chair seat and chair - Google Patents

Description

  The present invention relates to a chair seat. More specifically, the present invention relates to a seat structure suitable for application to, for example, a seat portion of a conference or office chair.

  2. Description of the Related Art Conventionally, in a structure of a chair seat, a structure has been adopted in which a slit is provided in a flexible plate material to facilitate bending. Specifically, for example, as shown in FIG. 15, the elastic plate material 101 constituting the seat and the elastic plate material 103 constituting the backrest are provided with a plurality of linear shapes in order to promote flexibility and increase flexibility. There is one in which slits 102 and 104 are formed (Patent Document 1).

  Further, as shown in FIG. 16, the structure of the slits 111 in the inner member 110 (also referred to as a shell) for the seat of the chair is complicated and the number of slits 111 is increased, thereby further facilitating the bending. There is something like that (Patent Document 2).

Japanese National Patent Publication No. 10-507091 JP 2000-093250 A

  However, like the structure of the chair seat of Patent Document 1, it cannot be said that the amount of bending deformation is sufficiently ensured only by the straight slit, and it is difficult to say that the sitting comfort is sufficiently comfortable. That is, since it is a seat of a chair, it needs to be formed of, for example, a resin member having a certain level of rigidity, so that simply providing a linear slit is sufficiently large to further improve the sitting comfort. It is difficult to realize and secure the amount of bending deformation. In this case, it may be possible to improve the sitting comfort by arranging a thick cushion on the upper surface of the inner member. However, in this case, the seat becomes thick and the appearance is not good. is there. In particular, in the case of a fixed chair or the like, the seat may be housed by stacking or the like, so that a thick seat has a problem that not only the appearance but also the volume reduction efficiency in the stacking state is lowered.

  In addition, in the structure of the chair seat of Patent Document 2, a large number of slits are provided even though a sufficient amount of flexural deformation can be achieved and secured by providing a large number of slits in order to promote flexural deformation. In order to do so, there is a possibility that the strength as a body holding member in the chair may not be sufficiently secured, and in order to provide many complicated slits, the mold at the time of molding becomes complicated and the molding cost is high There is a problem of becoming.

  Therefore, an object of the present invention is to provide a seat for a chair that can achieve both the realization and securing of a sufficient amount of bending deformation and the securing of sufficient strength while suppressing an increase in manufacturing cost. .

In order to achieve such an object, the seat of the chair of the present invention includes a shell formed of a resin material and having at least a central portion that can be bent and deformed, a seat frame on which the shell is attached to the upper surface, and at least a lower portion of the central portion of the shell. The elastic member is disposed , and both ends in the longitudinal direction of the elastic member are attached to the seat frame, and the elastic member elastically deforms and supports the central portion of the shell that is bent by the seating load of the seated person. I have to.

  Therefore, according to the seat of this chair, since the seat is composed of different types of elastic members, a high-grade seating comfort as a seat when seated is realized. Specifically, when the seat is composed of only the shell, especially when the seat is composed of only the thin shell, the shell is fully filled when a large load is applied to the shell or the load is applied suddenly. According to the present invention, the seat is constituted by the double structure of the shell and the elastic member, so that the shell is supported by the reaction force due to the deformation of the elastic member. The deformation of the prevents the occurrence of a bottom feeling.

  According to the seat of this chair, since the seat is constituted by the double structure of the shell and the elastic member, the strength is improved and the occurrence of sag compared to the case where the seat is constituted by the shell alone. Is prevented.

  According to this chair seat, there is no need to complicate the shape and arrangement of the slits as in the case of achieving a moderate and comfortable repulsive force with only the shell. The form of the mold becomes simple.

  In the seat of the chair of the present invention, the shell may be provided with a structure for promoting the deformation of the shell, and the structure for promoting the deformation of the shell may be a slit. In these cases, the repulsive force as a shell on the premise of the double structure with the elastic member can be adjusted to an appropriate value.

  In the seat of the chair of the present invention, the elastic member may be an S-shaped spring. In this case, a double structure of the shell and the elastic member is configured relatively easily.

  Moreover, the seat of the chair of this invention may make it the elastic member contact | abut on the lower surface of the said shell in the state in which the load is not applied to the shell and it is not bending below. In this case, when a load is applied to the seat and the shell bends downward, it is possible to prevent a sound (tactile noise) from hitting the lower surface of the shell against the elastic member.

  Moreover, the seat of the chair of this invention may be made to form an elastic member holding | maintenance part in the lower surface of a shell. In this case, the elastic member can be configured to be held in a state of being in contact with the lower surface of the shell by the elastic member holding portion.

  Moreover, the chair of this invention is provided with the above-mentioned seat. In this case, a chair with the above-described seat effect is realized.

  According to the seat of the chair of the present invention and the chair provided with this seat, it is possible to realize a high-grade seating comfort as a seat when seated, specifically, while supporting the shell while being supported by the reaction force due to the deformation of the elastic member. It is possible to prevent the occurrence of a feeling of bottoming by deforming, so that it is possible to improve comfort when sitting while realizing and securing a sufficient amount of bending deformation, and only the shell Compared to the case where the seat is constructed, the strength can be improved and the occurrence of sag can be prevented, so that sufficient strength is ensured and durability is improved. It becomes possible to maintain.

  According to the seat of the chair of the present invention and the chair provided with this seat, since the form of the mold for molding the shell can be simplified, it is possible to suppress an increase in manufacturing cost.

  The seat of the chair of the present invention or the chair provided with this seat is elastic when the structure for promoting the bending deformation is provided in the shell or when the structure for promoting the bending deformation is a slit. Since the repulsive force as a shell assuming a double structure with the member can be adjusted to an appropriate level, further improvement in comfort when seated with a sufficient and appropriate amount of flexure deformation is achieved. It becomes possible.

  Since the seat of the chair of the present invention and the chair provided with this seat can be configured with a relatively simple dual structure of the shell and the elastic member when the elastic member is an S-shaped spring, It becomes possible to improve versatility as a seat of a chair.

  When the seat of the chair of the present invention or the chair provided with this seat is configured so that the elastic member is in contact with the lower surface of the shell when the shell is not bent, the shell is bent when the shell is bent downward. Since the generation of noise (tactile noise) that hits the elastic member on the lower surface of the chair can be prevented, it is possible to prevent uncomfortable feelings of the seated person due to the generation of abnormal noise, and to improve the comfort of use of the chair. Improvement is possible.

  When the seat of the chair of the present invention or the chair provided with this seat is formed with the elastic member holding portion on the lower surface of the shell, the elastic member can be held in contact with the lower surface of the shell. Therefore, it is possible to surely exhibit the above-described effects of preventing the occurrence of the sound that the shell lower surface hits the elastic member and preventing the uncomfortable feeling of the seated person due to the generation of abnormal noise, and the comfort of use of the chair can be improved. Further improvement is possible.

It is a figure showing the front and side which show the whole structure of the chair of embodiment. It is a side view which shows the whole structure of the chair of embodiment. It is a perspective view which shows an example of embodiment of the seat of the chair of this invention. It is a figure of the state which removed the cushion from FIG. 3 (in other words, when the cushion of FIG. 3 is made transparent). FIG. 5 is a diagram in a state where the shell is removed from FIG. 4 (in other words, when the shell of FIG. 4 is made transparent). FIG. 6 is a diagram in a state in which the seat frame and the elastic member are removed from FIG. 5 (in other words, when the seat frame and the elastic member in FIG. 5 are made transparent). FIG. 7 is a diagram in a state in which the seat back cover is removed from FIG. 6 (in other words, when the seat back cover in FIG. 6 is made transparent). It is a figure of the seat of the chair of embodiment. (A) is a side view. (B) is a figure showing a side surface and a bottom face. It is an upper perspective view of the seat of the chair of an embodiment. It is a downward perspective view of the seat of the chair of an embodiment. It is a longitudinal cross-sectional view of the structure put together by the elastic member holding part in embodiment. It is a downward perspective view of the other example of the seat of a chair. It is a longitudinal cross-sectional view of the other example of the structure put together by the elastic member holding | maintenance part of the seat of a chair. It is a longitudinal cross-sectional view of the further another example of the structure put together by the elastic member holding | maintenance part of the seat of a chair. It is a perspective view which shows the seat and backrest of the conventional chair. It is a top view which shows the seat of the other conventional chair.

  Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings.

  1 to 14 show an example of the embodiment of the chair seat of the present invention. In the present specification, vertical, front-rear, and left-right are defined with reference to a seated person sitting on a chair seat, and particularly with respect to a seat when the seat is in a horizontal position. In addition to the state that the seat is in a horizontal position, it includes a state in which the seat surface is almost horizontal, and in addition to the state that the seat surface is in a vertical position, in addition to the state in which the seat surface is accurately vertical. Includes a state that is roughly vertical.

  In the present embodiment, a case where the seat of the chair of the present invention is applied to the chair 1 whose overall configuration is shown in FIGS. 1 and 2 will be described as an example.

  The chair 1 of this embodiment includes a support body 2, a seat 10 and a backrest 7 that are supported by the support body 2.

  The support body 2 includes a pair of front leg frames 3 and 3 that are arranged opposite to each other on the left and right sides, and a pair of sides that are arranged on the left and right sides of the pair of left and right front leg frames 3 and 3 so as to face each other. A pair of left and right side frames 4, 4, a pair of left and right side frames 4, 4, and a pair of rear leg frames 5, 5 disposed opposite to each other in the left and right direction. 4 and 4 and a horizontal frame 6 that is installed in the left-right direction.

  The front leg frame 3 and the side frame 4 are formed integrally by bending a single metal pipe material, specifically, a pipe material such as steel, stainless steel, or aluminum alloy into a generally square shape. Configured. The front leg frame 3 is disposed on the front side, and the side frame 4 is disposed on the rear side, and the front leg frame 3 is disposed so as to be inclined forward and downward and the side frame 4 is horizontal.

  In the middle position in the front-rear direction of each of the pair of left and right side frames 4, 4, toward the side frame 4 on the opposite side (in other words, on the other side when viewed from one side), that is, in the left-right direction toward the inside of the chair 1. A protruding rotating shaft 4a is provided.

  The rotation shafts 4a, 4a of the pair of left and right side frames 4, 4 are provided so as to face each other in the left-right direction. That is, the axial center direction of the rotation shaft 4a is the left-right direction, and the shaft centers of the pair of left and right rotation shafts 4a, 4a are coaxial. The rotating shaft 4a is joined to the peripheral surface of the side frame 4 by welding or the like.

  The rear leg frame 5 is made of, for example, a single metal pipe material made of the same material as the front leg frame 3 and the side frame 4 described above, and is arranged so as to be inclined rearward and downward in the front-rear direction.

  The rear end of the side frame 4 and the rear leg frame 5 are joined together by welding or the like at a position above the middle in the vertical direction of the rear leg frame 5.

  In the present embodiment, a caster 9A is attached to the lower end portion of the front leg frame 3, and a caster 9B is attached to the lower end portion of the rear leg frame 5. However, it is not essential in the present invention that the caster is attached to the leg frame.

  Here, in the present embodiment, the front leg frame 3 and the side frame 4 that are integrally formed as being continuous are the distance between the rear ends of the left and right side frames 4 and 4 in the left-right direction (in other words, The distance between the left and right front leg frames 3 and 3 in the left and right direction is narrower than the distance between the left and right rear leg frames 5 and 5 in the left and right direction. Specifically, when the plurality of chairs 1 are arranged in the front-rear direction in the horizontal direction, the left and right front leg frames 3, 3 of the rear chair 1 are between the left and right rear leg frames 5, 5 of the front chair 1. From between the left and right side frames 4 and 4, the plurality of chairs 1 are adjusted so that they can be stacked in the horizontal and front-rear directions.

  The horizontal frame 6 includes, for example, a single metal pipe material similar to the above-described frames 3, 4, and 5, and includes inclined portions 6 a and 6 a on both the left and right sides and an intermediate portion horizontal portion 6 b sandwiched between them. It is formed by being bent continuously.

  The horizontal frame 6 is arranged between the pair of left and right side frames 4, 4 so as to be in the left-right direction in plan view, so that the horizontal portion 6 b of the middle portion is recessed downward, and the seat 10 It arrange | positions so that the unevenness | corrugation (namely, curved surface shape) of a lower surface may be followed.

  The left and right ends of the horizontal frame 6 connect the pair of left and right side frames 4 and 4 at positions near the front ends of the pair of left and right side frames 4 and 4 (that is, positions near the front leg frame 3). So that they are joined together by welding or the like. The horizontal frame 6 is disposed at a position ahead of the pivot shaft 4 a provided on the side frame 4.

  The backrest 7 is made of a resin plate, and the intermediate portion in the left-right direction is bent backward and bent in a plan view, and the portion slightly below the center in the vertical direction is convex forward in a side view. It is formed in a curved shape.

  The backrest 7 has a pair of attachment portions 7a and 7a formed in a cylindrical shape having an opening at the lower end at the lower end portions on both the left and right sides. The backrest 7 is attached to the support 2 by fitting each of the pair of left and right attachment portions 7a, 7a to the upper end portions of the pair of left and right rear leg frames 5, 5. Note that the attachment portion 7a of the backrest 7 and the upper end portion of the rear leg frame 5 are bonded in advance with the upper end portion of the rear leg frame 5 inserted into the attachment portion 7a through the lower end opening. They are fixed to each other by agents and screws.

  The seat 10 includes a seat frame 11, a shell 13 (also referred to as an inner shell or an inner member) attached to the upper surface of the seat frame 11, an elastic member 12 disposed below the shell 13, and an upper surface of the shell 13. And a seat back cover 15 attached to the lower surface of the seat frame 11.

  4 and 8 to 10, only the right half of the shell 13 is shown for easy understanding. That is, the shell of the chair 1 actually has a symmetrical structure with the shell 13 shown in each drawing.

  The seat frame 11 is made of a single metal material, specifically, a bar / plate material such as steel, stainless steel or aluminum alloy, or various shapes, such as the front frame 11A, the left and right side frames 11B and 11B, and the rear frame. 11C and bent into a generally rectangular shape.

  Through holes 11d and 11d penetrating in the left-right direction are provided at positions behind the middle in the front-rear direction of the left and right side frames 11B, 11B of the seat frame 11 so as to face each other in the left-right direction.

  Then, the rotation shafts 4a and 4a provided on the pair of left and right side frames 4 and 4 are inserted into the pair of left and right through holes 11d and 11d, respectively.

  As a result, the seat 10 including the seat frame 11 is in a horizontal posture (FIGS. 1 to 3) with respect to the support body 2 and a posture (in other words, a vertical posture) in which the seat 10 is raised up along the backrest 7. It is mounted so as to rotate between the two. That is, the seat frame 11 rotates with respect to the support 2 with the pivot shaft 4a as a pivot support portion and the seat frame 11 as a pivot member.

  The seat 10 is in a horizontal posture when used for sitting by a seated person, and is in a vertical posture when the plurality of chairs 1 are stacked in the horizontal and front-rear directions.

  The shell 13 is formed of a resin material so as to have a thickness that allows at least a central portion to bend and deform, and is fixed to the upper surface of the seat frame 11 by, for example, screwing or the like. Although the shell 13 is generally formed in a plate shape as a whole, the shell 13 may be curved, may have a different thickness depending on a portion, or may have partial unevenness. Further, the shape of the shell 13 in plan view is not limited to a specific shape.

  In the present embodiment, the shell 13 is provided with a structure that promotes bending deformation.

  The structure for promoting the bending deformation of the shell 13 is not limited to a specific mode. Specifically, for example, a linear slit formed through the shell 13 in the vertical direction as in the present embodiment. 13a, a through hole such as a circle, an ellipse, a square, or a rectangle formed through the shell 13 in the vertical direction, or a linear shape formed in at least one of the upper surface side and the lower surface side of the shell 13 And a concave portion such as a perfect circle, an ellipse, a square, or a rectangle formed on at least one of the upper surface side and the lower surface side of the shell 13.

  Further, when a linear slit 13a or a groove as a linear recess is provided as a structure for promoting the bending deformation of the shell 13, the direction of the slit 13a or the groove is the front-rear direction, the left-right direction, or the front-rear left-right direction. Any of the directions inclined with respect to the angle may be used. Moreover, when a through-hole or a recessed part is provided as a structure that promotes the bending deformation of the shell 13, a variety of formation patterns / arrangement patterns of the through-hole or recessed part can be appropriately selected.

  It should be noted that one structure or a plurality of structures that promote the bending deformation of the shell 13 may be provided for the shell 13.

  The cushion 14 is provided on the upper surface of the shell 13 for improving the comfort by exhibiting elasticity as a seating surface when seated on the seat 10.

  Specifically, the cushion 14 includes a core material made of a material having elasticity such as urethane and an outer fabric covering at least an upper surface and a side surface of the core material.

  The cushion 14 is fixed while being placed on the upper surface of the shell 13. The method of attaching and fixing the cushion 14 to the shell 13 is not limited to a specific method, and specifically, for example, the core material and the shell 13 in a state where the core material is placed on the upper surface of the shell 13. The outer edge may be disposed so that the peripheral edge wraps around the side edge of the shell 13 and the peripheral edge wraps around the lower surface of the shell 13, and the peripheral edge may be attached to the shell 13 by tightening the string. The parts for use may be appropriately used and attached by screwing or the like.

  The seat back cover 15 is made of a resin material and has a concave portion that is bent downward so that the seat frame 11 can be accommodated between the shell 13 and a peripheral portion that rises upward from the peripheral end so as to surround the concave portion. Formed.

  The seat back cover 15 is fixed and attached to the lower surface of the seat frame 11 by, for example, screwing.

  A convex frame contact portion 15 a having a longitudinal direction in the left-right direction is provided at a substantially central position on the lower surface of the seat back cover 15. And the recessed part (in other words, bowl-shaped recessed part) of a longitudinal cross-sectional semicircle is formed in the lower end side of the said frame contact part 15a along a longitudinal direction.

  The seat 10 (specifically, the cushion 14) is in a suitable horizontal posture for seating in a state where the recess at the lower end of the frame contact portion 15a is in contact with the horizontal portion 6b of the horizontal frame 6.

  And the seat 10 of the chair which concerns on this invention in this embodiment is formed with the resin material, and the elastic member arrange | positioned under the at least center part of the shell 13 in which at least the center part can bend and deform | transformed. 12, and the elastic member 12 supports the center portion of the shell 13 which is bent by the seating load of the seated person by elastic deformation.

  The elastic member 12 exhibits an elastic force in the vertical direction against the bending deformation of the shell 13.

  In this embodiment, the shell 13 is attached to the upper surface of the seat frame 11 so that the seat frame 11 and the shell 13 are arranged in parallel, and both end portions (specifically, the elastic member 12 are disposed on the seat frame 11. The front end portion and the rear end portion) are supported, so that the elastic member 12 is disposed along the lower surface of the shell 13 below the shell 13.

  That is, both ends of the elastic member 12 are supported in the direction of the shell 13 as a whole, and are stretched along the direction of the shell 13 as a whole.

  The elastic member in the present invention is not limited to a specific one as long as it can exhibit an elastic force in the vertical direction in a state of being arranged along the direction of the shell 13 as a whole.

  In the present embodiment, specifically, an S-shaped spring (also referred to as an S spring or the like) is used as the elastic member 12. The S-shaped spring as the elastic member 12 of the present embodiment is arranged by arranging two S-shaped springs having a longitudinal direction in the front-rear direction, and the front end portions thereof are attached to the front frame 11A of the seat frame 11. At the same time, the rear end portion is attached to the rear frame 11C of the seat frame 11.

  The number of elastic members 12 is not limited to two, but may be one, or three or more.

  Further, the orientation of the elastic member 12 is not limited to the orientation in which the longitudinal direction is the front-rear direction, and may be the orientation in which the longitudinal direction is the left-right direction. Further, when a plurality of elastic members 12 are arranged, the configuration is not limited to a mode in which the plurality of elastic members 12 are arranged in parallel to each other, and the mutual distances change in the longitudinal direction, that is, parallel to each other. It may be arranged so that it is not.

  The elastic member 12 may be provided in contact with the lower surface of the shell 13 in a state where no load is applied to the seat 10, or may be provided on the lower surface of the shell 13 in a state where no load is applied to the seat 10. It may be provided so as to come into contact with the lower surface of the shell 13 when a load is applied to the seat 10 that is not in contact but the shell 13 is bent downward.

  In the present embodiment, the elastic member holding portion 16 is provided on the shell 13 so that the elastic member 12 is assembled in contact with the lower surface of the shell 13 in a state where no load is applied to the seat 10.

  In the present embodiment, specifically, a cross section L having a vertical portion 16a extending downward from the lower surface of the shell 13 and a horizontal portion 16b bent from the lower end portion of the vertical portion 16a and extending laterally. It is formed as a pair of elastic member holding portions 16, 16 that are formed in a letter shape and are continuously formed in the front-rear direction and that face each other.

  In the present embodiment, the shell 13 and the elastic member holding portion 16 are integrally formed. However, the shell 13 and the elastic member holding portion 16 are formed as separate members, and the elastic member is formed on the shell 13. The holding unit 16 may be attached.

  The left and right edges of the elastic member 12 are accommodated and held in the holding space 16c surrounded by the shell 13 and the vertical portion 16a and the horizontal portion 16b of the pair of left and right elastic member holding portions 16,16. Further, the elastic member 12 contacts the lower surface of the shell 13 in a state where the elastic member 12 is held in the holding space 16 c.

  Here, in a state where no load is applied to the seat 10, when the elastic member 12 is provided so as not to contact the lower surface of the shell 13, the load is applied to the seat 10 and the shell 13 bends downward. At that time, a sound (a crushing sound) that the lower surface of the shell 13 hits the elastic member 12 is generated, which causes an unpleasant feeling of the seated person.

  On the other hand, when the elastic member 12 is provided in contact with the lower surface of the shell 13 in a state where no load is applied to the seat 10 as in the present embodiment (in other words, from the beginning), the seat 10 When a load is applied to the shell 13 and the shell 13 bends downward, there is no sound (tactile noise) where the lower surface of the shell 13 hits the elastic member 12, and the generation of abnormal noise is prevented. Induction of pleasure can be prevented.

  Note that the elastic member holding portion is not limited to the aspect of the elastic member holding portion 16 in the present embodiment as long as the elastic member holding portion can hold the elastic member 12 in contact with the lower surface of the shell 13. Specifically, for example, the elastic member holding portion 16 of the present embodiment is provided over the entire length of the elastic member 12 in the longitudinal direction, that is, the front-rear direction, and is held over the entire length of the elastic member 12. For example, the elastic member 12 may be provided only in the vicinity of both end portions (in the present embodiment, the front end portion and the rear end portion) so as to hold only the both end portions, or in the vicinity of both end portions and the intermediate portion. It may be provided and intermittently held at both ends and the intermediate part. Moreover, although the elastic member holding | maintenance part 16 of this embodiment has the perpendicular | vertical part 16a and the horizontal part 16b, it is not restricted to this, A U-shaped or J-shaped hook or hook shape may be sufficient. Furthermore, one or a plurality of convex portions that protrude from the lower surface of the shell 13 and come into contact with the elastic member 12 may be used.

  In the present embodiment, the pair of elastic member holding portions 16 and 16 formed in a symmetrical manner facing left and right are provided, but the elastic member holding portion may not be in a symmetrical manner. Specifically, as shown in FIGS. 12 and 13, for example, an elastic member holding portion 16 having a vertical portion 16a and a horizontal portion 16b is provided on one of the left and right edge portions of the elastic member 12, and the elastic member holding is provided on the other side. A portion 16 ′ may be provided. The elastic member holding portion 16 'in this example has a vertical portion 16a extending downward from the lower surface of the shell 13, and a horizontal portion 16b bent from the lower end portion of the vertical portion 16a and extending in the lateral direction. These are formed intermittently in the front-rear direction corresponding to the position of the curved portion of the elastic member 12. In FIG. 12, only the right half of the shell 13 is shown for easy understanding. That is, the shell of the chair 1 actually has a symmetrical structure with the shell 13 shown in FIG.

  Further, as in the example shown in FIGS. 12 and 13, the elastic member holding portion 16 ′ is attached to the lower end side of the horizontal portion 16 b of the elastic member holding portion 16 ′ (that is, the elastic member holding portion provided opposite to the elastic member holding portion 16 ′). An inclined surface 16d inclined toward 16) may be formed. By forming the inclined surface 16d, one of the left and right edge portions of the elastic member 12 is inserted into the holding space 16c of the elastic member holding portion 16, and the other faces the inclined surface 16d of the elastic member holding portion 16 ′. Since the elastic member 12 is attached by being applied and pushed, the assembly work of the elastic member 12 to the shell 13 becomes easy.

  Further, when the shell 13 has a curved shape such as a waveform in a side view, it is difficult to arrange the elastic member 12 in contact with the lower surface of the shell 13 over the entire length in the front-rear direction. In such a case, the elastic member holding portion may be formed in a manner as shown in FIG. 14, for example. Specifically, the vertical portion 16a extending downward from the lower surface of the shell 13 is formed in the foot length, and the second horizontal portion 16e extending in the lateral direction is disposed above the horizontal portion 16b. The elastic member 12 may be sandwiched and held between the horizontal portion 16b and the second horizontal portion 16e. Thereby, whatever the shape of the shell 13 in the side view, the elastic member 12 is linearly or substantially linearly arranged in the side view by adjusting the length of the vertical portion 16a. And generation | occurrence | production of the sound which hits the elastic member 12 when the shell 13 bends below is prevented.

  In addition, by adjusting the assembly structure of the shell 13 and the elastic member 12, the elastic member 12 abuts on the lower surface of the shell 13 in a state where no load is applied to the seat 10 even without the elastic member holding portion. In other words, the elastic member holding portion may not be formed even if the elastic member 12 does not contact the lower surface of the shell 13 in a state where no load is applied to the seat 10. That is, in the present invention, the elastic member holding portion is not an essential configuration.

  According to the chair seat 10 configured as described above, since the seat 10 is constituted by different types of elastic members, that is, the double structure of the shell 13 and the elastic member 12, it is a high-grade seat as a seat when seated. It is possible to prevent a feeling of bottoming by realizing a comfortable sitting feeling, specifically, by deforming the shell 13 while being supported by a reaction force due to the deformation of the elastic member 12, and a sufficient amount of bending. It is possible to improve comfort when seated with the amount of deformation realized and secured.

  According to the chair seat 10 configured as described above, since the seat 10 is configured by the double structure of the shell 13 and the elastic member 12, it is stronger than the case where the seat is configured only by the shell. It is possible to prevent the occurrence of sag and to improve the durability by securing sufficient strength, and to maintain a comfortable sitting comfort.

  Although the above-described embodiment is an example of a preferred embodiment for carrying out the present invention, the embodiment of the present invention is not limited to the above-described embodiment, and the present invention is not limited to the scope of the present invention. The invention can be variously modified. For example, in the above-described embodiment, the seat according to the present invention is applied to the chair 1 whose overall configuration is shown in FIGS. 1 and 2, but the chair to which the present invention is applied is shown in FIGS. It is not restricted to the chair 1 to show, The thing of a various aspect can be selected suitably. Specifically, for example, it is not essential in the present invention that the seat 10 can be rotated or can be stacked in the horizontal / front-rear direction as in the chair 1 of the above-described embodiment, and is also supported. Various specific shapes and modes of the constituent members such as the body 2, the backrest 7, and the seat 10 can be appropriately selected based on the use and design of the chair. Furthermore, as an example, as a chair to which the present invention is applied, having the backrest 7 is not an essential configuration, and it is not an essential configuration that the seat 10 includes the cushion 14.

  In the above-described embodiment, the chair 1 includes the seat frame 11 and the seat back cover 15, but the chair to which the present invention is applied does not necessarily include the seat frame 11 and the seat back cover 15. Not a required configuration. That is, a component member that is configured as an integral unit having a configuration / function corresponding to the configuration / function of the seat frame 11 and the seat back cover 15 in the above-described embodiment may be used.

  In the above-described embodiment, a plurality of linear slits 13a are provided as a structure for promoting the deformation of the shell 13, but the structure for promoting the deformation of the shell 13 is, for example, a perfect circle as described above. A through hole such as an ellipse, square, or rectangle, or a groove or a perfect circle as a linear recess, or a recess such as an ellipse, square, or rectangle may be used. In addition, the shell 13 is not provided with a structure that promotes bending deformation. You may do it.

DESCRIPTION OF SYMBOLS 1 Chair 2 Support body 3 Front leg frame 4 Side frame 4a Rotating shaft 5 Rear leg frame 7 Backrest 10 Seat 11 Seat frame 12 Elastic member 13 Shell 13a Slit 15 Seat back cover

Claims (7)

It has a deformable shell deflection at least a central portion formed of a resin material, a seat frame to which the shell is attached to the top surface, and an elastic member disposed below the at least the central portion of the shell, the elastic member A chair seat characterized in that both ends in the longitudinal direction are attached to the seat frame and the central portion of the shell which is bent by a seating load of a seated person is supported by elastic deformation of the elastic member.   The chair seat according to claim 1, wherein the shell is provided with a structure that promotes bending deformation of the shell.   The seat of the chair according to claim 2, wherein the structure that promotes the bending deformation of the shell is a slit.   The chair seat according to claim 1, wherein the elastic member is an S-shaped spring.   The chair seat according to claim 1, wherein the elastic member is in contact with the lower surface of the shell in a state where no load is applied to the shell and the shell is not bent downward.   6. The chair seat according to claim 5, wherein an elastic member holding portion is formed on a lower surface of the shell.   A chair comprising the seat according to any one of claims 1 to 6.